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March 27, 1969
Soviet Union - Tyuratam (Baikonur Cosmodrome)
This Mars mission has been tentatively identified as an attempt at a landing. The
payload was an M-69 class probe (#521) with a total mass of 3495 kg. The third stage of
the SL-12/D-1-e (8K82K, #240-01 + 11S824) launcher exploded 438 seconds after launch.
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